The () is called upon to ,make more decisions affecting not only present but future earnings than any other department head.

单项选择题During the Middle Ages, hospitality was considered a () duty.

A. business
B. pleasure
C. food
D. Christian

单项选择题Short-duration cruises appear to be gaining in popularity as they ().

A. require less vacation time
B. are less expensive
C. are very safe
D. both A and B